CD274 and bullous pemphigoid: CIs targeting the PD‐L1/PD‐1 axis have been described to elicit a specific IgG autoantibody‐ and granulocyte‐driven inflammatory disease of the skin, namely bullous pemphigoid (BP), in about 0.3% to 0.6% of treated patients.7, 8, 9, 10, 11